/// <summary>
/// Move the currently selected classifier (defined by the
/// <seealso cref="SelectedIndex">SelectedIndex</seealso>
/// property) to earlier in the ordered list.
/// <para>
/// Private method that implements the <c>ICommand</c> <seealso cref="OrderEarlier">
/// OrderEarlier</seealso> through a <c>DelegateCommand</c>.
/// </para>
/// </summary>
/// <param name="obj">Delegate object data - unused.</param>
private void MoveItemUp(object obj)
{
if (selectedIndex != -1)
{
lock (this)
{
Debug.Assert(selectedIndex >= 0, "SelectedIndex must be valid, e.g. >= 0");
Debug.Assert(Classifiers.Count > 1, "Can only move item if more than one.");
lock (Classifiers)
{
Classifiers.Swap(selectedIndex, selectedIndex - 1);
}
}
}
}
/// <summary>
/// Move the currently selected classifier (defined by the
/// <seealso cref="SelectedIndex">SelectedIndex</seealso>
/// property) to later in the ordered list.
/// <para>
/// Private method that implements the <c>ICommand</c> <seealso cref="OrderLater">
/// OrderLater</seealso> through a <c>DelegateCommand</c>.
/// </para>
/// </summary>
/// <param name="obj">Delegate object data - unused.</param>
private void MoveItemDown(object obj)
{
if (selectedIndex != -1)
{
lock (this)
{
Debug.Assert(
selectedIndex >= 0,
"SelectedIndex must be >= 0.");
Debug.Assert(
selectedIndex < Classifiers.Count - 1,
"SelectedIndex must be within the index range of Items collection");
Debug.Assert(
Classifiers.Count > 1,
"Can not move an item unless there is more than one.");
lock (Classifiers)
{
Classifiers.Swap(selectedIndex, selectedIndex + 1);
}
}
}
}
